1. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575 Singapore
2. Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
3. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore
4. Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
5. Institute of Materials Research and Engineering, Agency for Science Technology and Research, 2 Fusionopolis Way, Innovis, 138634 Singapore
6. Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
7. Materials Research Laboratory, University of California, Santa Barbara, Santa Barbara, California 93106, United States